// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

#pragma once

#include <shared_mutex>
#include <cantor/catalog/factory/database_info.h>
#include <cantor/catalog/factory/storage.h>
#include <memory>
#include <turbo/container/flat_hash_map.h>
#include <turbo/container/flat_hash_set.h>

namespace cantor::catalog {
    class DatabaseQuerier;

    class NamespaceManager;

    class DatabaseManager {
    public:
        DatabaseManager() = default;

        turbo::Status create_database(std::shared_ptr<DatabaseInfo> info, CatalogStorage *storage,
                                      NamespaceManager *ns_manager);

        turbo::Status remove_database(const std::string &db_name, CatalogStorage *storage,
                                      NamespaceManager *ns_manager);

        turbo::Status update_database(std::shared_ptr<DatabaseInfo> info, CatalogStorage *storage);

        void set_max_id(const int64_t max_id);

        turbo::Status add_table_id(int64_t db_id, int64_t table_id);

        turbo::Status remove_table_id(int64_t db_id, int64_t table_id);

        void clear_tables(int64_t db_id);

    private:
        friend class DatabaseQuerier;

        int64_t _max_database_id{0};
        std::shared_mutex _mutex;
        turbo::flat_hash_map<int64_t, std::shared_ptr<DatabaseInfo> > _database_map;
        turbo::flat_hash_map<std::string, int64_t> _database_id_map;
        turbo::flat_hash_map<int64_t, turbo::flat_hash_set<int64_t> > _table_ids;
    };
} // database cantor::catalog
